My 137kHz 0.2mW ERP signal by M0BMU at 69km |
Showing posts with label qrss30. Show all posts
Showing posts with label qrss30. Show all posts
8 Sept 2011
Success on 137kHz QRPp
LF kit improvements
24W 137kHz QRSS30 beacon TX (ERP 0.2mW) |
137.5kHz 24W transverter (for WSPR) 0.2mW ERP |
Today I completed the first stage of my ERP improvement programme on 137kHz completing the rebuild of the QRSS30 beacon and the transverter used for WSPR on the band. Photos attached show both of these. My ERP has now increased to around 0.2mW with both rigs. The output from the PA stage in both rigs is around 23-24W. More power will be easily possible by raising the PA supply voltage later.
1 Sept 2011
Improved QRSS30 beacon on 137.769kHz
This afternoon I did some experimenting with some new 42mm 3C90 toroids and my 1kV WIMA polypropylene capacitors. I've managed to increase the RF output of my QRSS3/30 beacon by around 5-6dB so I've put this on beaconing over the evening and overnight period in the hope that someone will see the signal and send me some screen shots. ERP with this new beacon is around 150uW. Previous tests with the beacon ERP at around 50uW showed that the signal could be detected in The Netherlands. Each dB gained should improve my chances of being seen ever further. The screenshot shows my signal as received 101km away by G3WCB - quite a good signal at the peak of fades.
14 May 2011
QRSS30 QRPp beaconing on 137kHz band
PA3FNY's reception of the QRSS30 beacon XBM (me) |
7 May 2011
My 50uW ERP signal at 45km on 137kHz in QRSS30
Chris G3XIZ has sent me a nice screen shot showing my QRP beacon signal a couple of days ago. The signal is in QRSS30 and as Chris says, certainly good enough for a 2-way QRSS QSO on 137kHz. Chris is 45km from me.
1 May 2011
325km with 50uW ERP on 137kHz
Well, Henny PA3CPM has just sent me a new screen grab showing my signal at 1041z today on 137.676kHz in QRSS30. This time you can make out some of the CW (visible just below the continuous Loran line) and the periodicity between callsign blocks is visible confirming this is indeed my signal. Distance is 325km (202 miles) to JO22mb square. This is the first time my 137kHz signal has got into mainland Europe. I am amazed that a really simple beacon on a tiny board into a simple wire loop in the garden can span such distances. Even more amazed that Henny could find it!
29 Apr 2011
QRSS3 beaconing on 137.6748kHz
My QRSS30 (slow CW) LF beacon has just been started up. I'm hoping that QRSS30 will get me reports from a bit further afield. Any reports and screen grabs would be much appreciated. It will be on for much of the weekend unless I need the antenna for some VLF tests. The message cycle takes about 25 minutes and best results will be with Argo, Spectran or Spectrum Lab software on a PC and FFT bandwidths of around 0.1Hz.
Message: XBM in QRSS30, pause, then G3XBM in 10wpm
Freq: 137.6748kHz
ERP: 50uW (antenna 80sq m vertical loop)
Location: JO02dg, Burwell Cambs
Message: XBM in QRSS30, pause, then G3XBM in 10wpm
Freq: 137.6748kHz
ERP: 50uW (antenna 80sq m vertical loop)
Location: JO02dg, Burwell Cambs
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